Attachment for rendering power-presses non-repeating.



E. G JENNER.

ATTACHMENTWFOR RENDERING POWER PRESSES NON-REPEATI'NG.

* APPLICATION FILED DEC. 22. I915.

Pmented July 25, 1916,.

APPLICATION flLED DEC. 22. I915.

Patented Judy 25, 1916.

' 2 SHEETSSHEET 2 .fidfl 07": fli /5157f 59 ERNST G. JENNER, OF CHICAGO, ILLINOIS.

ATTACHMENT FOR RENDERING POWER-PRESSES NON-REPEATING.

Specification of Letters Patent.

Patented July 25, 1916.

Application .filed December 22,1915. Serial No. 68,152.

power presses, the object being to prevent the press from repeating unless the operator consciously wills to do so and takes definite steps to have it do so.

The object of the invention is to produce a device of this character which is simple in construction and certain in operation.

It is also my purpose to provide adjust- I ments by which my. safety device may be held out ofaction so that the operator, by keeping the treadle depressed, may cause the press to repeat continuously.

Another object of the invention is to provide means to prevent the operator from accidentally coupling the two parts of the treadle by stepping or otherwise placingthe weight upon the trcadle shank.

I accomplish my objects 'by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a front elevation of a ress equipped with my attachment. Part of the view is in section on the line 1'l, Fig. 2. Fig. 2 is a side elevation of a press equipped with my attachment, part of the press being broken away to reveal some of the-parts of the attachment. Fig. 3 is a sectional detail on the line 3-3, Fig. 2, showing the pin clutch of the press. Fig. 4 is a perspective view of the chief operating parts of my attachment and some ofthe associated parts of the press. Fig; 5 is a view of the same parts as shown in Fig. 4, but shown in changed position.

Similar numerals refer to similar parts throughout the several views.

My attachment may be applied to presses of various designs. In the design selected to illustrate the invention the slide l ofthe press is operated by an eccentric 2 rigidly N fastened on the eccentric or crank shaft 3,

, Fig. 8.

The crank shaft is journaled in the framework 4 of the press and has a fly wheel 5 loosely mounted on it. Power is applied to the fly wheel in any suitable manner. It rotates continuously, while the crank shaft must rotate only when called for. The movement'of the fly wheel is transmitted to the crank shaft, when required, by a clutch which may assume various forms. In

the form shown, the fly wheel has a disk-like hub 6 and alongside of this is a disk 7 which is keyed or otherwise rigidly fastened -to the crank shaft. A clutch pin 8 is slidably mounted in the disk 7 parallel to the axis of the shaft, as shown in section in enters the socket 9 provided for its reception in the adjacent side of the hub of the fly wheel, the fly wheel and .disk'will rotate together and cause the crank shaft to rotate. When the pin is withdrawn, the fly wheel will continue to rotate but the shaft will stand still. A spring 10 constantly urges the pin toward the fly wheel hub. A clutch fork l1 isslidingly mounted in a bracket 12 attached to the side ofthe machine frame lVhen the inner end of the pin andguides the fork toward and from the clutch pin. Said pin has a notch 8 formed in the side, and when the fork has fully entered the notch it holds the pin innonacting position. The bracket 12, contains a spring 13 which constantly urges the fork toward the pin. The front end of the fork is beveled or cam shaped to enable it to enter the notch when the pin is in acting position and gradually withdraw the pin from the fly wheel hub as the pin travels around the axis of the shaft. In other words, if the fork spring 13 is permitted to act, it forces the fork up into the path of the pin and this automatically throws the clutch out. As soon as the clutch is out the clutch disk 7 ceases to rotate and hence will remain quiet until the fork is depressed and thus made to release the clutch pin. .As

soon as the pin is thus released, it auto'' matically engages the fly wheel hub and causes the crank shaft to rotate. The fork is controlled by a chain -14 or equivalent device, ln the form shown, the pin Soon;

stitutes a connecting element and the fork 11 a lock-out element for locking the conthe treadle will lie in close contact with the rigidly secured to said lever.

necting element in non-active position.

In my device the clutch chain 14 is not connected directly to the treadle 16, (or at least to the portion carrying the pedal 17) but is indirectly connected thereto through the agency of a novel combinaton of elements which will now be described.

In my construction the clutch chain is connected to an element 20 which for identification may be called the clutch-controlling lever. It is fulcrumed upon a stationary rod 21 mounted in the baseof the mac ine frame. In the particular instance il ustrated, the chain is connected to said lever about midway between its ends. By preference, lever 20 is in the form of an inverted channel fitting over the treadle. The rear end of the treadle is pivotally supported by a pin 22, which is mounted in said lever, by

preference, approximately midway between its ends. The exact position of pin 22 relatively to said lever, is, however, non-essential. The parts are so constructed and arranged that when held up only by pin'22, it will drop down onto the floor, or at least it' will drop down until its adjustable screw stop 23 rests upon the floor. But with my device the treadle will normaly be held up in close contact with the lever 20 by a crank or eccentric 25 which is fulcrumed upon a pin 26 carried by a post 27 rising from and links 28 are pivotally connected with crank 25 by a pin 19 located at a point sufficiently remote from the fulcrum pin 26'and at their lower end said links carry a cross bar 29 upon which the treadle rests. The proportions are such that when the crank 25 is rotated to acting position, as shown in Fig. 4,

lever 20 and be capable of operating it to control the clutch, but when said crank is rotated to non-acting position, as shown in .Fig. 5, the treadle will lie upon the floor and be incapable of affecting the clutch. In this position it may be said to be out of gear.

Crank 25 has a leg 25 adapted to descend onto the top of the clutch-controlling lever 20 as shown in Figs. 2 and 4. In rotating I v to this position the pin 19 travels slightly beyond a line passing vertically through "'the-pin 26. Hence the crank may be said to have passed beyond center, or to be overbalanced, and as a result the weight'of the links 28'and of the treadle carried thereby,

. holds the crank safely in acting position.

In my device the treadle may be thrown out of gear manually and automatically.

The manually operated mechanism consists of a pull rod 30 connected to the outer end A pair of which holds the front end of the rod within convenient reach of the operator.

is connected to a cam operated lever 37.

Said link consists of two bars '38 and 39, the bar 38 having a lengthwise slot 40 for accommodating a screw 41 projecting from bar 39 and carrying a wing nut 42 by which .the parts may be fastened together. This provides for lengthwise adjustment of the parts. In the best design, bar 38 is provided with a pin 44 capable of entering any one of a series of holes 43 in bar 39. This makes for security when the parts have been brought to the proper adjustment. Lever 37 is fulcrumed upon a stationary stud 45 projecting in the present design from the side of bracket 12. An antifriction'roller from the point of attachment of bar 39. This, under normal running conditions, lies in the path of the. cam 48 formed on the periphery of the clutch disk 7.

In operation, letit be assumed that the operator desires to operate the press under normal running conditions under which the 46 is mounted at the end of lever 37. remote slide will descend only when the treadle is depressed. He first pulls the. rod 30 and sets the crank 25 in acting position, shown in Fig. 4, which will thus'lock the treadle to the clutch-controlling lever 20 and cause said parts to act as a single piece. operator depresses the treadle he causes the chain 14 to descend and withdraw the fork 11 from the clutch pin 8, thus permitting the spring 10 to throw said pin into the socket 9 in the hubr6 of the fly wheel. This locks the clutch parts together and causes the shaft 3 to rotate and the slide to descend.

If, now, the

Now, if the operator promptly releases the treadle and permits it to rise completely, (under the'infiuence of the spring 13) the clutch fork will'rise early enough to engage the clutch pin before the latter has made a complete revolution about the axis of the shaft and willwithdraw the pin from the hub of the fly wheel. This will disconnect the main shaft from the power and permit the shaft to come to rest. But operators do not always release the treadle promptly enough and they frequently fail to permit the treadle to rise completely. My device prevents the press from repeating under such conditions, for the cam 48 is so located on the clutch disk 7 that unless the treadle is completely raised, said cam will engage the roller 46 and, acting through the parts 37, 38, 39, 35 and 36, throw the crank 25 to.

non-acting position, thus uncoupling the masses treadle (or throwing it, out of gear) as shown in Fig. 5. This permits the clutchcontrolling lever 20 to riseindependently of time. Said cam 48 is timed to operate ahead of the time that the clutch fork would normally engage the clutch pin to throw it out and hence there is no possibility of the press repeating accidentally because before the press can repeat the cam 48 will have acted and thrown the treadle out of gear. After the treadle has once been thrown out of gear it cannot be a ain coupled to the. lever '20'ii'ntil the cranr 25 is deliberately returned to acting position through the medium of the pull rod 30 or otherwise.

The stop 23 is provided as an extra precaution to prevent the treadle from being accidentally thrown back into gear by reason of a weight falling on it or the operator put.- ting his foot on it accidentally at a point near the end of lever 20. This will be best understood by referring to Fig. 5, in which the treadle is shown with its outer end resting upon the fioor. Suppose the stop 23 were absent, and the operator in resetting his dies or attending to some other duties about the press should step upon the treadle near the outer end of the lever 20, the outer end of treadle, resting upon the floor, would act as a fulcrum point, and the weight of the operator would have the effect of lowering the pin 22. On account of the arrangement of the parts, this would cause the pin 26 to descend faster than the pin 19 and rotate the crank 25 from'non-acting to acting position. This would recouple the treadle to the lever 20 and cause the press to repeat without the operator intending it to do so. I have thus provided a stop or supplemental support in the treadle at a point remote from the outer end thereof to prevent the treadle from being accidentally thrown into gear by being subjected to a weight at a point remote from the outer end of the treadle. course, there are occasions when it is desirable to have the press repeat continuously so long as the operator holds the treadle depressed. I have arranged for this by making the connecting link 33, 39 adjustable ,as

i to length in the manner previously described.

By adjusting this link so that its effective length is longer than under the conditions above described, the anti-friction roller 46' will be permanently held out of reach ofthe cam 48 and will, therefore, be unaffected by it.

It will be understood that I use the wordtreadle because the controlling element in presses is usually in-the form of a foot-op- Grated element. I wish it understood, howsaid lever and treadle will operate in unison, 'or said treadle will be movable independently of said lever,

2. A power press having a clutch and a clutch-controlling lever, in combination with a treadle pivotally supported at its inner end adjacent to said lever, and a crank con nected to both the treadle and lever, said crank when in one position locking the lever 'and treadle together and when in another position permitting the'lever to move independently of the treadle.

3. A power press having a clutch and a clutch-controlling lever, in combination with a treadle pivotally supported at its inner end adjacent to said lever, a crank con nected to both the treadle and lever, said crank when in one position locking the lever and treadle together and when in another position permitting the lever to move independently of the treadle, and means for controlling the positionof said crank.

4. A power press having a slide, a main shaft for operating said slide, a clutch for throwing-said shaft into and out of con-' nection with the power, and a lever for controlling said clutch; in combination with a treadle, a crank connectedto both the treadle and lever for coupling and uncoupling them, and automatic means operated by said shaft for throwing said crank to the position in which the treadle and lever will .be uncoupled.

5. A power press having a slide, a'main shaft for operating said slide, a clutch for throwing said shaft into and out of connection with the power, and a lever for controlling said clutch; in combination with a treadle, a crank connected to both the treadle and lever for coupling and uncoupling them, a cam on said shaft, and connections between said camand said crank for throwing said crank to non-acting or.uncoupled position when acted upon by said cam.

6; A power press having a slide, a main shaft for operating said slide, a clutch for throwing said shaft into and out of connection with the power, and a lever for controlling said clutch; in combination with a treadle, a crank connected to both the treadle and lever for coupling and uncoupling them, a second lever having a pivotal axis coincident with the axis of the clutchcontrolling lever, said second lever being connected to said crank for throwing it to nonacting position, a rotating cam operated by said shaft, and connection between said cam and said second lever for operating said second lever to throw said crank to nonacting position.

7. A power press having a slide, a main shaft for operating said .slide, a clutch for throwing said shaft into and out of connection with the power, and a lever for controlling said clutch; in combination with a treadle, a crank connected to both the treadle and lever for coupling and uncouling them, a rotating cam operated by said shaft and a linleand-lever connection between said cam and said crank for throwing said crank to non-acting position, Said connection including an extensible, adjust-' able link which, when extended, holds the connection out of. reach of said lever.

8. A power press, having a slide, a main shaft for operating said slide, a clutch for throwing said clutch into and out of connection with the power, and a lever for controllingsaidclutch; in combination with a treadle pivotally supported at its inner end upon said lever, a crank mounted upon said lever, connections between said crank and said treadle whereby, when the crank is in acting position, the treadle and lever will move in unison and when said crank is thrown to non-acting position said lever is free to move independently of said treadle, a cam rotating in unison with the main shalt, and means actuated by said cam :tor throwlng said crank to non-actlng pos1tion.

9. A power press, having a slide, a main shaft for operating said slide, a clutch for throwing'said clutch lnto'and out of connection with the power, anda lever for con trolling said clutch; in combination with a treadle pivotally supported at its inner end upon said lover, a crank mounted upon said lever, connections between said crank and said treadle whereby, when the crank is in acting position, the treadle and lever will move in unison and when said crank is thrown to non-acting position said leveris free to more independently of said treadle, a "cam rotating in unison with the main shaft, a pair of levers, in addition to the first, one of the levers of the pair being con nected to the crank for operating it and the other lever of the pair being normally sub-' ject to the action of said cam, and a link connecting said pair of levers, said link. being adjustable as to length, whereby the lever which is normally acted upon by the cam, may be permanently held out of reach of said-cam. 4

10. A power press having a clutch, and a clutch-controlling lever; in combination with a treadle pivoted at its inner endto said lever, and a stop on said treadle for preventing the depression of the inner end of said treadle when the outer end of the treadle is held against descent,

11. A power press having a clutch and a clutch-controlling lever, in combination with a treadle pivoted at its inner end to said lever, means for coupling and uncoupling said treadle and lever,.said lever beinn able to rise independently of the treadle when the parts are uncoupled, and a stop remote froni the outer end of the treadle for preventing the descent of the inner end of the treadle when the outer end of the treadle is held against descent.

12. A power press having a clutch and a clatoll-controlling lever, in combination with a treadle pivoted at its inner end to said lever, means for coupling and uncoupling said treadle and lever, said lever being able to rise independently of the treadle when the parts are uncoupled, and a stop remote from the outer end of the treadle for preventing the descent of the inner end of the treadle when the outer end of the treadle is held against descent, said stop being mounted upon. said treadle and vertically adjustable with reference thereto. p

13. A power press having a continuously rotating power device, a slide, a clutch for causing said shaft to operate said slide, said clutch having a connecting element tending looking out said connecting element, and a rotary cam acting upon said manually operated element in advance of the point Where said lock-out element tends to engage said connecting element, to thereby render said manually operated means ineffective to prevent said lock-out element from looking out the connecting element.

14. A power presshaving a continuously rotating power device, a slide, a clutch for causing said shaft to operate said slide, said clutch having a connecting'element tending normally to assume acting or connecting positionwhen said power device reaches a predetermined point in its rotation, said connecting element rotating in unison with said power device when the clutch is in, a lock-out element movably mounted upon a stationary part of the-machineior holding said connecting element in non-acting position, said lock-out element normally engaging said connecting element prior to the point in its rotation Where said connecting element would normally .move to acting position, a lever for moving said lock-out element to a position Where 1t Will not act upon said connecting element, a treadle for operating said lever, said treadle being conneetible' toand disconnectible from said leverfand a rotary cam for disconnecting said lever from said treadle, said cam being timed to act in advance of the point where said lock-out acts upon said connecting element.

In witness whereof, I have hereunto sub- 20 scribed my name.

ERNST G. JENNER- 

